Avoid a type mismatch that shows up in C++11.
Taken from <https://bugs.debian.org/853560>.

--- a/src/rtphint.cpp	2012-05-20 16:11:53.000000000 -0600
+++ b/src/rtphint.cpp	2017-05-16 10:25:26.930705191 -0600
@@ -339,7 +339,7 @@
                 pSlash = strchr(pSlash, '/');
                 if (pSlash != NULL) {
                     pSlash++;
-                    if (pSlash != '\0') {
+                    if (*pSlash != '\0') {
                         length = (uint32_t)strlen(pRtpMap) - (pSlash - pRtpMap);
                         *ppEncodingParams = (char *)MP4Calloc(length + 1);
                         strncpy(*ppEncodingParams, pSlash, length);
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<tr><td><span title='2017-03-21 20:58:52 +0200'>2017-03-21</span></td><td><a href='/guix/commit/gnu/packages/ots.scm?id=8ea71f20050f9faf1f1faba4b02216436aee783d'>gnu: ots: Use 'modify-phases' syntax.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/ots.scm (ots)[arguments]: Use 'modify-phases' syntax.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2017-03-21 20:58:51 +0200'>2017-03-21</span></td><td><a href='/guix/commit/gnu/packages/ots.scm?id=b1d3e0a93bf12a29fc43144156a181f409e6b362'>gnu: ots: Add download mirror.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/ots.scm (ots)[source]: Add Debian mirror.
</span></span></td><td>Efraim Flashner</td></tr>